[V8] Cooling/ radiator question

[Kneale Brownson]

I'd check out Steve B's suggestion regarding the viscous fan coupling on 
the main fan.  I was unaware there even was a viscous coupling there.  I 
thought that fan ran off the belt continuously.

The thermostat is behind a cover on the front of the engine.  It's item # 4 
in this image:  http://catalog.exist.ru/pic/parts/VAG09078.gif

At 04:22 PM 03/15/2002 -0600, Steve Kramer wrote:

>I will be doing the timing belt in the near future - the water pump and the
>timing belt were done in 1999.  However, the rollers and pulleys were kept
>and not changed out.  So, i can have the water pump done at that time.
>Blaufergnugen has one for $250. I have a price from Foreign car Clinic for
>$850 for the timing belt/roller/pulleys.  Definitely a better price over
>Midtex quote of $2500 !!!!
>
>Aside from that I know that my 200 had the thermostat changed out twice over
>the 4 year period I owned it.
>
>  - where is this thermostat ? And what of these sensors.  There is a
>sensoror something that connects to the antifreeze inlet at the upper
>radiator hose inlet.
>
>thanks
>
>Steve Kramer
>
>
> > From: Kneale Brownson <knotnook at traverse.com>
> > Date: Fri, 15 Mar 2002 16:49:28 -0500
> > To: Steve Kramer <skramer at mac.com>
> > Subject: Re: [V8] Cooling/ radiator question
> >
> > If the fan comes on with the A/C, then the fusible link is OK.  The link is
> > in a black box a couple inches square mounted to the same bracket that
> > supports the hydraulics reservoir.  It's actually between the reservoir and
> > inner fender on the front of the reservoir bracket.
> >
> > If that fan's working, your other symptoms sound like a water circulation
> > problem, either from a failing water pump (I have no idea how they fail
> > other than leaking) or a thermostat that's not opening soon enough.
> >
> > At 03:36 PM 03/15/2002 -0600, Steve Kramer wrote:
> >
> >> Kneale ,  I will check.  The aux. fan does go on - when I turn on the ac
> >>
> >> Also I have looked under the hood when it's idling and it hasn't gone off
> >> when the car was running - except when I've switched on the ac.
> >>
> >>
> >> Where again is this box - is this the box located behind the driver's side
> >> headlamp assembly and before the big rectangular resevoir?
> >>
> >>
> >> Steve Kramer
> >>
> >>
> >>> From: Kneale Brownson <knotnook at traverse.com>
> >>> Date: Fri, 15 Mar 2002 16:00:21 -0500
> >>> To: Steve Kramer <skramer at mac.com>, <v8 at audifans.com>,
> >> <quattro at audifans.com>
> >>> Subject: Re: [V8] Cooling/ radiator question
> >>>
> >>> Do you know whether the electric auxiliary fan also comes on when the
> >>> coolant temperature rises, Steve?  There is an 80-amp fusible link 
> mounted
> >>> in a little black box on the front of the hydraulic system oil
> >>> reservoir.  Take the cover off and be certain the link is intact.  It can
> >>> "look" ok, but actually have failed.  They seem to fail regularly.  No
> >>> fusible link means the electric fan never runs.
> >>>
> >>>
> >>> At 02:18 PM 03/15/2002 -0600, Steve Kramer wrote:
> >>>
> >>>> One of the nice selling points for this car over my 89 200 was the more
> >>>> straightforward type of cooling system as opposed to the cooling 
> system on
> >>>> the 200.
> >>>>
> >>>> Having a radiator fan cooling the radiator all the time is nice on 
> the V8.
> >>>> However, I am getting the feeling that this engine is running 
> hot.  As to
> >>>> not repeat the problems I had with my other car I would like to get your
> >>>> opinions.  I either think the water pump is dying or there are some
> >> sensors
> >>>> that aren't doing their jobs.
> >>>>
> >>>> Here's the diagnosis.
> >>>>
> >>>> Car runs good. I drive on the highway to get to work. It takes me 
> about 30
> >>>> minutes
> >>>>
> >>>> As temperature increases - oil starts to thin down.  I find that when
> >> I get
> >>>> to work my oil pressure/ bar gauge is around 1  Oil temp is at 60 and
> >>>> coolant temp is just above middle line at idle.  This is all happening
> >> on a
> >>>> 50 degree day.
> >>>>
> >>>> A typical day I am driving this car at 80mph on the highway for 20 of
> >> the 30
> >>>> minutes.  Driving at 80 the bar pressure is at 5 and the coolant temp
> >> is at
> >>>> the middle line.
> >>>>
> >>>> The multi function alert system says everything is fine.  No temp
> >> warning or
> >>>> anything.  I have replaced the upper hose because it had developed a 
> small
> >>>> leak.  The other hoses are in good/ fair shape but no leaks.  There 
> is no
> >>>> loss in liquid at the expansion tank after I drive.
> >>>>
> >>>> Does the V8 typically run hot?  The radiator is cooling the antifreeze
> >>>> properly because the radiator feels cool to the touch.  But the engine,
> >>>> hoses and coolant are very hot when I turn off the car.  I'm a little
> >>>> concerned.  If not the pump are there cooling sensors that are not 
> feeding
> >>>> the proper amount of coolant through the engine.  Where are the 
> different
> >>>> sensors?
> >>>>
> >>>>
> >>>> Thanks
> >>>>
> >>>>
> >>>> Steve Kramer
> >>>> 90V8 q
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> >